There Are..The Great Barrier Reef has species that range from Microscopic Plankton to Humpback WhalesWhat's the Comparison in Size of Animals?They look like fish, but they are actually mammals.there are more than 30 types of dolphinsGenerally they are very activeDolphins have tails called flukes. They move them up and down, which moves them through the water. They use echolocation, squeaks, whistles, and clicks to talk to each other and find preyThe DolphinThere are 9 different types of Hammerhead sharksTheir skeletons are made of cartilage. Cartilage is softer than bone but still stiff. Most sharks are loners meaning they swim and hunt alone. However scalloped hammerheads and bonnethead sharks swim in groups or schools. Hammerhead SharksAll whales are cetaceanscetacean means marine mammals including whales, dolphins and porpoisesThey perform special, above water behaviors. such as Breaching- jumping out of the water and landing on their backs. They may do this up to 100 timesLob Tailing- Sticking their tails out of the waterTheir flippers are 1/3rd of their body lengthThe Humpback WhaleSaving the Best for Last...The Green Sea Turtle, found at the Great Barrier Reef is the second largest turtleThey can weigh up to 500 lbs!Sea Turtles don't reach maturity until 20-50 years, but they can live for 80-100+ years after that!Sea Turtles spend almost all their time underwaterWhen they are asleep their blood delivers oxygen making it possible to stay underwater for hours at a time!Sea Turtles!!! :)Coral reefsLagoon floorIslandsOpen waterSeagrassesCoastlineEstuariesFreshwater wetlandsForested floodplainHeath and shrublandsGrass and sedgelandsWoodlandsForests and rainforestsHow has the ecosystem changed over the years?

Pollutant levels Fish stocks depleted Up to 70-80% of wetlands lost Phosphate and nitrogen increased by 200-1500% in river dischargeshttp://www.livescience.com/23611-image-gallery-great-barrier-reef-through-time.html"A food web consists of all the food chainsin a ecosystem." Every living thing inan ecosystem fits in a part of the food chain. Each food chain is one possible way to reserve energy and nutrients that moves through the ecosystem. -National Geographic